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linuxdebug/drivers/mmc/host/jz4740_mmc.c

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null pointer error
2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
* Copyright (C) 2013, Imagination Technologies
*
* JZ4740 SD/MMC controller driver
*/
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/mmc/host.h>
#include <linux/mmc/slot-gpio.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/scatterlist.h>
#include <asm/cacheflush.h>
#define JZ_REG_MMC_STRPCL 0x00
#define JZ_REG_MMC_STATUS 0x04
#define JZ_REG_MMC_CLKRT 0x08
#define JZ_REG_MMC_CMDAT 0x0C
#define JZ_REG_MMC_RESTO 0x10
#define JZ_REG_MMC_RDTO 0x14
#define JZ_REG_MMC_BLKLEN 0x18
#define JZ_REG_MMC_NOB 0x1C
#define JZ_REG_MMC_SNOB 0x20
#define JZ_REG_MMC_IMASK 0x24
#define JZ_REG_MMC_IREG 0x28
#define JZ_REG_MMC_CMD 0x2C
#define JZ_REG_MMC_ARG 0x30
#define JZ_REG_MMC_RESP_FIFO 0x34
#define JZ_REG_MMC_RXFIFO 0x38
#define JZ_REG_MMC_TXFIFO 0x3C
#define JZ_REG_MMC_LPM 0x40
#define JZ_REG_MMC_DMAC 0x44
#define JZ_MMC_STRPCL_EXIT_MULTIPLE BIT(7)
#define JZ_MMC_STRPCL_EXIT_TRANSFER BIT(6)
#define JZ_MMC_STRPCL_START_READWAIT BIT(5)
#define JZ_MMC_STRPCL_STOP_READWAIT BIT(4)
#define JZ_MMC_STRPCL_RESET BIT(3)
#define JZ_MMC_STRPCL_START_OP BIT(2)
#define JZ_MMC_STRPCL_CLOCK_CONTROL (BIT(1) | BIT(0))
#define JZ_MMC_STRPCL_CLOCK_STOP BIT(0)
#define JZ_MMC_STRPCL_CLOCK_START BIT(1)
#define JZ_MMC_STATUS_IS_RESETTING BIT(15)
#define JZ_MMC_STATUS_SDIO_INT_ACTIVE BIT(14)
#define JZ_MMC_STATUS_PRG_DONE BIT(13)
#define JZ_MMC_STATUS_DATA_TRAN_DONE BIT(12)
#define JZ_MMC_STATUS_END_CMD_RES BIT(11)
#define JZ_MMC_STATUS_DATA_FIFO_AFULL BIT(10)
#define JZ_MMC_STATUS_IS_READWAIT BIT(9)
#define JZ_MMC_STATUS_CLK_EN BIT(8)
#define JZ_MMC_STATUS_DATA_FIFO_FULL BIT(7)
#define JZ_MMC_STATUS_DATA_FIFO_EMPTY BIT(6)
#define JZ_MMC_STATUS_CRC_RES_ERR BIT(5)
#define JZ_MMC_STATUS_CRC_READ_ERROR BIT(4)
#define JZ_MMC_STATUS_TIMEOUT_WRITE BIT(3)
#define JZ_MMC_STATUS_CRC_WRITE_ERROR BIT(2)
#define JZ_MMC_STATUS_TIMEOUT_RES BIT(1)
#define JZ_MMC_STATUS_TIMEOUT_READ BIT(0)
#define JZ_MMC_STATUS_READ_ERROR_MASK (BIT(4) | BIT(0))
#define JZ_MMC_STATUS_WRITE_ERROR_MASK (BIT(3) | BIT(2))
#define JZ_MMC_CMDAT_IO_ABORT BIT(11)
#define JZ_MMC_CMDAT_BUS_WIDTH_4BIT BIT(10)
#define JZ_MMC_CMDAT_BUS_WIDTH_8BIT (BIT(10) | BIT(9))
#define JZ_MMC_CMDAT_BUS_WIDTH_MASK (BIT(10) | BIT(9))
#define JZ_MMC_CMDAT_DMA_EN BIT(8)
#define JZ_MMC_CMDAT_INIT BIT(7)
#define JZ_MMC_CMDAT_BUSY BIT(6)
#define JZ_MMC_CMDAT_STREAM BIT(5)
#define JZ_MMC_CMDAT_WRITE BIT(4)
#define JZ_MMC_CMDAT_DATA_EN BIT(3)
#define JZ_MMC_CMDAT_RESPONSE_FORMAT (BIT(2) | BIT(1) | BIT(0))
#define JZ_MMC_CMDAT_RSP_R1 1
#define JZ_MMC_CMDAT_RSP_R2 2
#define JZ_MMC_CMDAT_RSP_R3 3
#define JZ_MMC_IRQ_SDIO BIT(7)
#define JZ_MMC_IRQ_TXFIFO_WR_REQ BIT(6)
#define JZ_MMC_IRQ_RXFIFO_RD_REQ BIT(5)
#define JZ_MMC_IRQ_END_CMD_RES BIT(2)
#define JZ_MMC_IRQ_PRG_DONE BIT(1)
#define JZ_MMC_IRQ_DATA_TRAN_DONE BIT(0)
#define JZ_MMC_DMAC_DMA_SEL BIT(1)
#define JZ_MMC_DMAC_DMA_EN BIT(0)
#define JZ_MMC_LPM_DRV_RISING BIT(31)
#define JZ_MMC_LPM_DRV_RISING_QTR_PHASE_DLY BIT(31)
#define JZ_MMC_LPM_DRV_RISING_1NS_DLY BIT(30)
#define JZ_MMC_LPM_SMP_RISING_QTR_OR_HALF_PHASE_DLY BIT(29)
#define JZ_MMC_LPM_LOW_POWER_MODE_EN BIT(0)
#define JZ_MMC_CLK_RATE 24000000
#define JZ_MMC_REQ_TIMEOUT_MS 5000
enum jz4740_mmc_version {
JZ_MMC_JZ4740,
JZ_MMC_JZ4725B,
JZ_MMC_JZ4760,
JZ_MMC_JZ4780,
JZ_MMC_X1000,
};
enum jz4740_mmc_state {
JZ4740_MMC_STATE_READ_RESPONSE,
JZ4740_MMC_STATE_TRANSFER_DATA,
JZ4740_MMC_STATE_SEND_STOP,
JZ4740_MMC_STATE_DONE,
};
/*
* The MMC core allows to prepare a mmc_request while another mmc_request
* is in-flight. This is used via the pre_req/post_req hooks.
* This driver uses the pre_req/post_req hooks to map/unmap the mmc_request.
* Following what other drivers do (sdhci, dw_mmc) we use the following cookie
* flags to keep track of the mmc_request mapping state.
*
* COOKIE_UNMAPPED: the request is not mapped.
* COOKIE_PREMAPPED: the request was mapped in pre_req,
* and should be unmapped in post_req.
* COOKIE_MAPPED: the request was mapped in the irq handler,
* and should be unmapped before mmc_request_done is called..
*/
enum jz4780_cookie {
COOKIE_UNMAPPED = 0,
COOKIE_PREMAPPED,
COOKIE_MAPPED,
};
struct jz4740_mmc_host {
struct mmc_host *mmc;
struct platform_device *pdev;
struct clk *clk;
enum jz4740_mmc_version version;
int irq;
void __iomem *base;
struct resource *mem_res;
struct mmc_request *req;
struct mmc_command *cmd;
unsigned long waiting;
uint32_t cmdat;
uint32_t irq_mask;
spinlock_t lock;
struct timer_list timeout_timer;
struct sg_mapping_iter miter;
enum jz4740_mmc_state state;
/* DMA support */
struct dma_chan *dma_rx;
struct dma_chan *dma_tx;
bool use_dma;
/* The DMA trigger level is 8 words, that is to say, the DMA read
* trigger is when data words in MSC_RXFIFO is >= 8 and the DMA write
* trigger is when data words in MSC_TXFIFO is < 8.
*/
#define JZ4740_MMC_FIFO_HALF_SIZE 8
};
static void jz4740_mmc_write_irq_mask(struct jz4740_mmc_host *host,
uint32_t val)
{
if (host->version >= JZ_MMC_JZ4725B)
return writel(val, host->base + JZ_REG_MMC_IMASK);
else
return writew(val, host->base + JZ_REG_MMC_IMASK);
}
static void jz4740_mmc_write_irq_reg(struct jz4740_mmc_host *host,
uint32_t val)
{
if (host->version >= JZ_MMC_JZ4780)
writel(val, host->base + JZ_REG_MMC_IREG);
else
writew(val, host->base + JZ_REG_MMC_IREG);
}
static uint32_t jz4740_mmc_read_irq_reg(struct jz4740_mmc_host *host)
{
if (host->version >= JZ_MMC_JZ4780)
return readl(host->base + JZ_REG_MMC_IREG);
else
return readw(host->base + JZ_REG_MMC_IREG);
}
/*----------------------------------------------------------------------------*/
/* DMA infrastructure */
static void jz4740_mmc_release_dma_channels(struct jz4740_mmc_host *host)
{
if (!host->use_dma)
return;
dma_release_channel(host->dma_tx);
if (host->dma_rx)
dma_release_channel(host->dma_rx);
}
static int jz4740_mmc_acquire_dma_channels(struct jz4740_mmc_host *host)
{
struct device *dev = mmc_dev(host->mmc);
host->dma_tx = dma_request_chan(dev, "tx-rx");
if (!IS_ERR(host->dma_tx))
return 0;
if (PTR_ERR(host->dma_tx) != -ENODEV) {
dev_err(dev, "Failed to get dma tx-rx channel\n");
return PTR_ERR(host->dma_tx);
}
host->dma_tx = dma_request_chan(mmc_dev(host->mmc), "tx");
if (IS_ERR(host->dma_tx)) {
dev_err(mmc_dev(host->mmc), "Failed to get dma_tx channel\n");
return PTR_ERR(host->dma_tx);
}
host->dma_rx = dma_request_chan(mmc_dev(host->mmc), "rx");
if (IS_ERR(host->dma_rx)) {
dev_err(mmc_dev(host->mmc), "Failed to get dma_rx channel\n");
dma_release_channel(host->dma_tx);
return PTR_ERR(host->dma_rx);
}
/*
* Limit the maximum segment size in any SG entry according to
* the parameters of the DMA engine device.
*/
if (host->dma_tx) {
struct device *dev = host->dma_tx->device->dev;
unsigned int max_seg_size = dma_get_max_seg_size(dev);
if (max_seg_size < host->mmc->max_seg_size)
host->mmc->max_seg_size = max_seg_size;
}
if (host->dma_rx) {
struct device *dev = host->dma_rx->device->dev;
unsigned int max_seg_size = dma_get_max_seg_size(dev);
if (max_seg_size < host->mmc->max_seg_size)
host->mmc->max_seg_size = max_seg_size;
}
return 0;
}
static inline struct dma_chan *jz4740_mmc_get_dma_chan(struct jz4740_mmc_host *host,
struct mmc_data *data)
{
if ((data->flags & MMC_DATA_READ) && host->dma_rx)
return host->dma_rx;
else
return host->dma_tx;
}
static void jz4740_mmc_dma_unmap(struct jz4740_mmc_host *host,
struct mmc_data *data)
{
struct dma_chan *chan = jz4740_mmc_get_dma_chan(host, data);
enum dma_data_direction dir = mmc_get_dma_dir(data);
dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, dir);
data->host_cookie = COOKIE_UNMAPPED;
}
/* Prepares DMA data for current or next transfer.
* A request can be in-flight when this is called.
*/
static int jz4740_mmc_prepare_dma_data(struct jz4740_mmc_host *host,
struct mmc_data *data,
int cookie)
{
struct dma_chan *chan = jz4740_mmc_get_dma_chan(host, data);
enum dma_data_direction dir = mmc_get_dma_dir(data);
unsigned int sg_count;
if (data->host_cookie == COOKIE_PREMAPPED)
return data->sg_count;
sg_count = dma_map_sg(chan->device->dev,
data->sg,
data->sg_len,
dir);
if (!sg_count) {
dev_err(mmc_dev(host->mmc),
"Failed to map scatterlist for DMA operation\n");
return -EINVAL;
}
data->sg_count = sg_count;
data->host_cookie = cookie;
return data->sg_count;
}
static int jz4740_mmc_start_dma_transfer(struct jz4740_mmc_host *host,
struct mmc_data *data)
{
struct dma_chan *chan = jz4740_mmc_get_dma_chan(host, data);
struct dma_async_tx_descriptor *desc;
struct dma_slave_config conf = {
.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
.src_maxburst = JZ4740_MMC_FIFO_HALF_SIZE,
.dst_maxburst = JZ4740_MMC_FIFO_HALF_SIZE,
};
int sg_count;
if (data->flags & MMC_DATA_WRITE) {
conf.direction = DMA_MEM_TO_DEV;
conf.dst_addr = host->mem_res->start + JZ_REG_MMC_TXFIFO;
} else {
conf.direction = DMA_DEV_TO_MEM;
conf.src_addr = host->mem_res->start + JZ_REG_MMC_RXFIFO;
}
sg_count = jz4740_mmc_prepare_dma_data(host, data, COOKIE_MAPPED);
if (sg_count < 0)
return sg_count;
dmaengine_slave_config(chan, &conf);
desc = dmaengine_prep_slave_sg(chan, data->sg, sg_count,
conf.direction,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc) {
dev_err(mmc_dev(host->mmc),
"Failed to allocate DMA %s descriptor",
conf.direction == DMA_MEM_TO_DEV ? "TX" : "RX");
goto dma_unmap;
}
dmaengine_submit(desc);
dma_async_issue_pending(chan);
return 0;
dma_unmap:
if (data->host_cookie == COOKIE_MAPPED)
jz4740_mmc_dma_unmap(host, data);
return -ENOMEM;
}
static void jz4740_mmc_pre_request(struct mmc_host *mmc,
struct mmc_request *mrq)
{
struct jz4740_mmc_host *host = mmc_priv(mmc);
struct mmc_data *data = mrq->data;
if (!host->use_dma)
return;
data->host_cookie = COOKIE_UNMAPPED;
if (jz4740_mmc_prepare_dma_data(host, data, COOKIE_PREMAPPED) < 0)
data->host_cookie = COOKIE_UNMAPPED;
}
static void jz4740_mmc_post_request(struct mmc_host *mmc,
struct mmc_request *mrq,
int err)
{
struct jz4740_mmc_host *host = mmc_priv(mmc);
struct mmc_data *data = mrq->data;
if (data && data->host_cookie != COOKIE_UNMAPPED)
jz4740_mmc_dma_unmap(host, data);
if (err) {
struct dma_chan *chan = jz4740_mmc_get_dma_chan(host, data);
dmaengine_terminate_all(chan);
}
}
/*----------------------------------------------------------------------------*/
static void jz4740_mmc_set_irq_enabled(struct jz4740_mmc_host *host,
unsigned int irq, bool enabled)
{
unsigned long flags;
spin_lock_irqsave(&host->lock, flags);
if (enabled)
host->irq_mask &= ~irq;
else
host->irq_mask |= irq;
jz4740_mmc_write_irq_mask(host, host->irq_mask);
spin_unlock_irqrestore(&host->lock, flags);
}
static void jz4740_mmc_clock_enable(struct jz4740_mmc_host *host,
bool start_transfer)
{
uint16_t val = JZ_MMC_STRPCL_CLOCK_START;
if (start_transfer)
val |= JZ_MMC_STRPCL_START_OP;
writew(val, host->base + JZ_REG_MMC_STRPCL);
}
static void jz4740_mmc_clock_disable(struct jz4740_mmc_host *host)
{
uint32_t status;
unsigned int timeout = 1000;
writew(JZ_MMC_STRPCL_CLOCK_STOP, host->base + JZ_REG_MMC_STRPCL);
do {
status = readl(host->base + JZ_REG_MMC_STATUS);
} while (status & JZ_MMC_STATUS_CLK_EN && --timeout);
}
static void jz4740_mmc_reset(struct jz4740_mmc_host *host)
{
uint32_t status;
unsigned int timeout = 1000;
writew(JZ_MMC_STRPCL_RESET, host->base + JZ_REG_MMC_STRPCL);
udelay(10);
do {
status = readl(host->base + JZ_REG_MMC_STATUS);
} while (status & JZ_MMC_STATUS_IS_RESETTING && --timeout);
}
static void jz4740_mmc_request_done(struct jz4740_mmc_host *host)
{
struct mmc_request *req;
struct mmc_data *data;
req = host->req;
data = req->data;
host->req = NULL;
if (data && data->host_cookie == COOKIE_MAPPED)
jz4740_mmc_dma_unmap(host, data);
mmc_request_done(host->mmc, req);
}
static unsigned int jz4740_mmc_poll_irq(struct jz4740_mmc_host *host,
unsigned int irq)
{
unsigned int timeout = 0x800;
uint32_t status;
do {
status = jz4740_mmc_read_irq_reg(host);
} while (!(status & irq) && --timeout);
if (timeout == 0) {
set_bit(0, &host->waiting);
mod_timer(&host->timeout_timer,
jiffies + msecs_to_jiffies(JZ_MMC_REQ_TIMEOUT_MS));
jz4740_mmc_set_irq_enabled(host, irq, true);
return true;
}
return false;
}
static void jz4740_mmc_transfer_check_state(struct jz4740_mmc_host *host,
struct mmc_data *data)
{
int status;
status = readl(host->base + JZ_REG_MMC_STATUS);
if (status & JZ_MMC_STATUS_WRITE_ERROR_MASK) {
if (status & (JZ_MMC_STATUS_TIMEOUT_WRITE)) {
host->req->cmd->error = -ETIMEDOUT;
data->error = -ETIMEDOUT;
} else {
host->req->cmd->error = -EIO;
data->error = -EIO;
}
} else if (status & JZ_MMC_STATUS_READ_ERROR_MASK) {
if (status & (JZ_MMC_STATUS_TIMEOUT_READ)) {
host->req->cmd->error = -ETIMEDOUT;
data->error = -ETIMEDOUT;
} else {
host->req->cmd->error = -EIO;
data->error = -EIO;
}
}
}
static bool jz4740_mmc_write_data(struct jz4740_mmc_host *host,
struct mmc_data *data)
{
struct sg_mapping_iter *miter = &host->miter;
void __iomem *fifo_addr = host->base + JZ_REG_MMC_TXFIFO;
uint32_t *buf;
bool timeout;
size_t i, j;
while (sg_miter_next(miter)) {
buf = miter->addr;
i = miter->length / 4;
j = i / 8;
i = i & 0x7;
while (j) {
timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
if (unlikely(timeout))
goto poll_timeout;
writel(buf[0], fifo_addr);
writel(buf[1], fifo_addr);
writel(buf[2], fifo_addr);
writel(buf[3], fifo_addr);
writel(buf[4], fifo_addr);
writel(buf[5], fifo_addr);
writel(buf[6], fifo_addr);
writel(buf[7], fifo_addr);
buf += 8;
--j;
}
if (unlikely(i)) {
timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
if (unlikely(timeout))
goto poll_timeout;
while (i) {
writel(*buf, fifo_addr);
++buf;
--i;
}
}
data->bytes_xfered += miter->length;
}
sg_miter_stop(miter);
return false;
poll_timeout:
miter->consumed = (void *)buf - miter->addr;
data->bytes_xfered += miter->consumed;
sg_miter_stop(miter);
return true;
}
static bool jz4740_mmc_read_data(struct jz4740_mmc_host *host,
struct mmc_data *data)
{
struct sg_mapping_iter *miter = &host->miter;
void __iomem *fifo_addr = host->base + JZ_REG_MMC_RXFIFO;
uint32_t *buf;
uint32_t d;
uint32_t status;
size_t i, j;
unsigned int timeout;
while (sg_miter_next(miter)) {
buf = miter->addr;
i = miter->length;
j = i / 32;
i = i & 0x1f;
while (j) {
timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_RXFIFO_RD_REQ);
if (unlikely(timeout))
goto poll_timeout;
buf[0] = readl(fifo_addr);
buf[1] = readl(fifo_addr);
buf[2] = readl(fifo_addr);
buf[3] = readl(fifo_addr);
buf[4] = readl(fifo_addr);
buf[5] = readl(fifo_addr);
buf[6] = readl(fifo_addr);
buf[7] = readl(fifo_addr);
buf += 8;
--j;
}
if (unlikely(i)) {
timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_RXFIFO_RD_REQ);
if (unlikely(timeout))
goto poll_timeout;
while (i >= 4) {
*buf++ = readl(fifo_addr);
i -= 4;
}
if (unlikely(i > 0)) {
d = readl(fifo_addr);
memcpy(buf, &d, i);
}
}
data->bytes_xfered += miter->length;
}
sg_miter_stop(miter);
/* For whatever reason there is sometime one word more in the fifo then
* requested */
timeout = 1000;
status = readl(host->base + JZ_REG_MMC_STATUS);
while (!(status & JZ_MMC_STATUS_DATA_FIFO_EMPTY) && --timeout) {
d = readl(fifo_addr);
status = readl(host->base + JZ_REG_MMC_STATUS);
}
return false;
poll_timeout:
miter->consumed = (void *)buf - miter->addr;
data->bytes_xfered += miter->consumed;
sg_miter_stop(miter);
return true;
}
static void jz4740_mmc_timeout(struct timer_list *t)
{
struct jz4740_mmc_host *host = from_timer(host, t, timeout_timer);
if (!test_and_clear_bit(0, &host->waiting))
return;
jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_END_CMD_RES, false);
host->req->cmd->error = -ETIMEDOUT;
jz4740_mmc_request_done(host);
}
static void jz4740_mmc_read_response(struct jz4740_mmc_host *host,
struct mmc_command *cmd)
{
int i;
uint16_t tmp;
void __iomem *fifo_addr = host->base + JZ_REG_MMC_RESP_FIFO;
if (cmd->flags & MMC_RSP_136) {
tmp = readw(fifo_addr);
for (i = 0; i < 4; ++i) {
cmd->resp[i] = tmp << 24;
tmp = readw(fifo_addr);
cmd->resp[i] |= tmp << 8;
tmp = readw(fifo_addr);
cmd->resp[i] |= tmp >> 8;
}
} else {
cmd->resp[0] = readw(fifo_addr) << 24;
cmd->resp[0] |= readw(fifo_addr) << 8;
cmd->resp[0] |= readw(fifo_addr) & 0xff;
}
}
static void jz4740_mmc_send_command(struct jz4740_mmc_host *host,
struct mmc_command *cmd)
{
uint32_t cmdat = host->cmdat;
host->cmdat &= ~JZ_MMC_CMDAT_INIT;
jz4740_mmc_clock_disable(host);
host->cmd = cmd;
if (cmd->flags & MMC_RSP_BUSY)
cmdat |= JZ_MMC_CMDAT_BUSY;
switch (mmc_resp_type(cmd)) {
case MMC_RSP_R1B:
case MMC_RSP_R1:
cmdat |= JZ_MMC_CMDAT_RSP_R1;
break;
case MMC_RSP_R2:
cmdat |= JZ_MMC_CMDAT_RSP_R2;
break;
case MMC_RSP_R3:
cmdat |= JZ_MMC_CMDAT_RSP_R3;
break;
default:
break;
}
if (cmd->data) {
cmdat |= JZ_MMC_CMDAT_DATA_EN;
if (cmd->data->flags & MMC_DATA_WRITE)
cmdat |= JZ_MMC_CMDAT_WRITE;
if (host->use_dma) {
/*
* The JZ4780's MMC controller has integrated DMA ability
* in addition to being able to use the external DMA
* controller. It moves DMA control bits to a separate
* register. The DMA_SEL bit chooses the external
* controller over the integrated one. Earlier SoCs
* can only use the external controller, and have a
* single DMA enable bit in CMDAT.
*/
if (host->version >= JZ_MMC_JZ4780) {
writel(JZ_MMC_DMAC_DMA_EN | JZ_MMC_DMAC_DMA_SEL,
host->base + JZ_REG_MMC_DMAC);
} else {
cmdat |= JZ_MMC_CMDAT_DMA_EN;
}
} else if (host->version >= JZ_MMC_JZ4780) {
writel(0, host->base + JZ_REG_MMC_DMAC);
}
writew(cmd->data->blksz, host->base + JZ_REG_MMC_BLKLEN);
writew(cmd->data->blocks, host->base + JZ_REG_MMC_NOB);
}
writeb(cmd->opcode, host->base + JZ_REG_MMC_CMD);
writel(cmd->arg, host->base + JZ_REG_MMC_ARG);
writel(cmdat, host->base + JZ_REG_MMC_CMDAT);
jz4740_mmc_clock_enable(host, 1);
}
static void jz_mmc_prepare_data_transfer(struct jz4740_mmc_host *host)
{
struct mmc_command *cmd = host->req->cmd;
struct mmc_data *data = cmd->data;
int direction;
if (data->flags & MMC_DATA_READ)
direction = SG_MITER_TO_SG;
else
direction = SG_MITER_FROM_SG;
sg_miter_start(&host->miter, data->sg, data->sg_len, direction);
}
static irqreturn_t jz_mmc_irq_worker(int irq, void *devid)
{
struct jz4740_mmc_host *host = (struct jz4740_mmc_host *)devid;
struct mmc_command *cmd = host->req->cmd;
struct mmc_request *req = host->req;
struct mmc_data *data = cmd->data;
bool timeout = false;
if (cmd->error)
host->state = JZ4740_MMC_STATE_DONE;
switch (host->state) {
case JZ4740_MMC_STATE_READ_RESPONSE:
if (cmd->flags & MMC_RSP_PRESENT)
jz4740_mmc_read_response(host, cmd);
if (!data)
break;
jz_mmc_prepare_data_transfer(host);
fallthrough;
case JZ4740_MMC_STATE_TRANSFER_DATA:
if (host->use_dma) {
/* Use DMA if enabled.
* Data transfer direction is defined later by
* relying on data flags in
* jz4740_mmc_prepare_dma_data() and
* jz4740_mmc_start_dma_transfer().
*/
timeout = jz4740_mmc_start_dma_transfer(host, data);
data->bytes_xfered = data->blocks * data->blksz;
} else if (data->flags & MMC_DATA_READ)
/* Use PIO if DMA is not enabled.
* Data transfer direction was defined before
* by relying on data flags in
* jz_mmc_prepare_data_transfer().
*/
timeout = jz4740_mmc_read_data(host, data);
else
timeout = jz4740_mmc_write_data(host, data);
if (unlikely(timeout)) {
host->state = JZ4740_MMC_STATE_TRANSFER_DATA;
break;
}
jz4740_mmc_transfer_check_state(host, data);
timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_DATA_TRAN_DONE);
if (unlikely(timeout)) {
host->state = JZ4740_MMC_STATE_SEND_STOP;
break;
}
jz4740_mmc_write_irq_reg(host, JZ_MMC_IRQ_DATA_TRAN_DONE);
fallthrough;
case JZ4740_MMC_STATE_SEND_STOP:
if (!req->stop)
break;
jz4740_mmc_send_command(host, req->stop);
if (mmc_resp_type(req->stop) & MMC_RSP_BUSY) {
timeout = jz4740_mmc_poll_irq(host,
JZ_MMC_IRQ_PRG_DONE);
if (timeout) {
host->state = JZ4740_MMC_STATE_DONE;
break;
}
}
fallthrough;
case JZ4740_MMC_STATE_DONE:
break;
}
if (!timeout)
jz4740_mmc_request_done(host);
return IRQ_HANDLED;
}
static irqreturn_t jz_mmc_irq(int irq, void *devid)
{
struct jz4740_mmc_host *host = devid;
struct mmc_command *cmd = host->cmd;
uint32_t irq_reg, status, tmp;
status = readl(host->base + JZ_REG_MMC_STATUS);
irq_reg = jz4740_mmc_read_irq_reg(host);
tmp = irq_reg;
irq_reg &= ~host->irq_mask;
tmp &= ~(JZ_MMC_IRQ_TXFIFO_WR_REQ | JZ_MMC_IRQ_RXFIFO_RD_REQ |
JZ_MMC_IRQ_PRG_DONE | JZ_MMC_IRQ_DATA_TRAN_DONE);
if (tmp != irq_reg)
jz4740_mmc_write_irq_reg(host, tmp & ~irq_reg);
if (irq_reg & JZ_MMC_IRQ_SDIO) {
jz4740_mmc_write_irq_reg(host, JZ_MMC_IRQ_SDIO);
mmc_signal_sdio_irq(host->mmc);
irq_reg &= ~JZ_MMC_IRQ_SDIO;
}
if (host->req && cmd && irq_reg) {
if (test_and_clear_bit(0, &host->waiting)) {
del_timer(&host->timeout_timer);
if (status & JZ_MMC_STATUS_TIMEOUT_RES) {
cmd->error = -ETIMEDOUT;
} else if (status & JZ_MMC_STATUS_CRC_RES_ERR) {
cmd->error = -EIO;
} else if (status & (JZ_MMC_STATUS_CRC_READ_ERROR |
JZ_MMC_STATUS_CRC_WRITE_ERROR)) {
if (cmd->data)
cmd->data->error = -EIO;
cmd->error = -EIO;
}
jz4740_mmc_set_irq_enabled(host, irq_reg, false);
jz4740_mmc_write_irq_reg(host, irq_reg);
return IRQ_WAKE_THREAD;
}
}
return IRQ_HANDLED;
}
static int jz4740_mmc_set_clock_rate(struct jz4740_mmc_host *host, int rate)
{
int div = 0;
int real_rate;
jz4740_mmc_clock_disable(host);
clk_set_rate(host->clk, host->mmc->f_max);
real_rate = clk_get_rate(host->clk);
while (real_rate > rate && div < 7) {
++div;
real_rate >>= 1;
}
writew(div, host->base + JZ_REG_MMC_CLKRT);
if (real_rate > 25000000) {
if (host->version >= JZ_MMC_JZ4780) {
writel(JZ_MMC_LPM_DRV_RISING_QTR_PHASE_DLY |
JZ_MMC_LPM_SMP_RISING_QTR_OR_HALF_PHASE_DLY |
JZ_MMC_LPM_LOW_POWER_MODE_EN,
host->base + JZ_REG_MMC_LPM);
} else if (host->version >= JZ_MMC_JZ4760) {
writel(JZ_MMC_LPM_DRV_RISING |
JZ_MMC_LPM_LOW_POWER_MODE_EN,
host->base + JZ_REG_MMC_LPM);
} else if (host->version >= JZ_MMC_JZ4725B)
writel(JZ_MMC_LPM_LOW_POWER_MODE_EN,
host->base + JZ_REG_MMC_LPM);
}
return real_rate;
}
static void jz4740_mmc_request(struct mmc_host *mmc, struct mmc_request *req)
{
struct jz4740_mmc_host *host = mmc_priv(mmc);
host->req = req;
jz4740_mmc_write_irq_reg(host, ~0);
jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_END_CMD_RES, true);
host->state = JZ4740_MMC_STATE_READ_RESPONSE;
set_bit(0, &host->waiting);
mod_timer(&host->timeout_timer,
jiffies + msecs_to_jiffies(JZ_MMC_REQ_TIMEOUT_MS));
jz4740_mmc_send_command(host, req->cmd);
}
static void jz4740_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct jz4740_mmc_host *host = mmc_priv(mmc);
if (ios->clock)
jz4740_mmc_set_clock_rate(host, ios->clock);
switch (ios->power_mode) {
case MMC_POWER_UP:
jz4740_mmc_reset(host);
if (!IS_ERR(mmc->supply.vmmc))
mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
host->cmdat |= JZ_MMC_CMDAT_INIT;
clk_prepare_enable(host->clk);
break;
case MMC_POWER_ON:
break;
default:
if (!IS_ERR(mmc->supply.vmmc))
mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
clk_disable_unprepare(host->clk);
break;
}
switch (ios->bus_width) {
case MMC_BUS_WIDTH_1:
host->cmdat &= ~JZ_MMC_CMDAT_BUS_WIDTH_MASK;
break;
case MMC_BUS_WIDTH_4:
host->cmdat &= ~JZ_MMC_CMDAT_BUS_WIDTH_MASK;
host->cmdat |= JZ_MMC_CMDAT_BUS_WIDTH_4BIT;
break;
case MMC_BUS_WIDTH_8:
host->cmdat &= ~JZ_MMC_CMDAT_BUS_WIDTH_MASK;
host->cmdat |= JZ_MMC_CMDAT_BUS_WIDTH_8BIT;
break;
default:
break;
}
}
static void jz4740_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
{
struct jz4740_mmc_host *host = mmc_priv(mmc);
jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_SDIO, enable);
}
static const struct mmc_host_ops jz4740_mmc_ops = {
.request = jz4740_mmc_request,
.pre_req = jz4740_mmc_pre_request,
.post_req = jz4740_mmc_post_request,
.set_ios = jz4740_mmc_set_ios,
.get_ro = mmc_gpio_get_ro,
.get_cd = mmc_gpio_get_cd,
.enable_sdio_irq = jz4740_mmc_enable_sdio_irq,
};
static const struct of_device_id jz4740_mmc_of_match[] = {
{ .compatible = "ingenic,jz4740-mmc", .data = (void *) JZ_MMC_JZ4740 },
{ .compatible = "ingenic,jz4725b-mmc", .data = (void *)JZ_MMC_JZ4725B },
{ .compatible = "ingenic,jz4760-mmc", .data = (void *) JZ_MMC_JZ4760 },
{ .compatible = "ingenic,jz4775-mmc", .data = (void *) JZ_MMC_JZ4780 },
{ .compatible = "ingenic,jz4780-mmc", .data = (void *) JZ_MMC_JZ4780 },
{ .compatible = "ingenic,x1000-mmc", .data = (void *) JZ_MMC_X1000 },
{},
};
MODULE_DEVICE_TABLE(of, jz4740_mmc_of_match);
static int jz4740_mmc_probe(struct platform_device* pdev)
{
int ret;
struct mmc_host *mmc;
struct jz4740_mmc_host *host;
const struct of_device_id *match;
mmc = mmc_alloc_host(sizeof(struct jz4740_mmc_host), &pdev->dev);
if (!mmc) {
dev_err(&pdev->dev, "Failed to alloc mmc host structure\n");
return -ENOMEM;
}
host = mmc_priv(mmc);
match = of_match_device(jz4740_mmc_of_match, &pdev->dev);
if (match) {
host->version = (enum jz4740_mmc_version)match->data;
} else {
/* JZ4740 should be the only one using legacy probe */
host->version = JZ_MMC_JZ4740;
}
ret = mmc_of_parse(mmc);
if (ret) {
dev_err_probe(&pdev->dev, ret, "could not parse device properties\n");
goto err_free_host;
}
mmc_regulator_get_supply(mmc);
host->irq = platform_get_irq(pdev, 0);
if (host->irq < 0) {
ret = host->irq;
goto err_free_host;
}
host->clk = devm_clk_get(&pdev->dev, "mmc");
if (IS_ERR(host->clk)) {
ret = PTR_ERR(host->clk);
dev_err(&pdev->dev, "Failed to get mmc clock\n");
goto err_free_host;
}
host->mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
host->base = devm_ioremap_resource(&pdev->dev, host->mem_res);
if (IS_ERR(host->base)) {
ret = PTR_ERR(host->base);
goto err_free_host;
}
mmc->ops = &jz4740_mmc_ops;
if (!mmc->f_max)
mmc->f_max = JZ_MMC_CLK_RATE;
/*
* There seems to be a problem with this driver on the JZ4760 and
* JZ4760B SoCs. There, when using the maximum rate supported (50 MHz),
* the communication fails with many SD cards.
* Until this bug is sorted out, limit the maximum rate to 24 MHz.
*/
if (host->version == JZ_MMC_JZ4760 && mmc->f_max > JZ_MMC_CLK_RATE)
mmc->f_max = JZ_MMC_CLK_RATE;
mmc->f_min = mmc->f_max / 128;
mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
/*
* We use a fixed timeout of 5s, hence inform the core about it. A
* future improvement should instead respect the cmd->busy_timeout.
*/
mmc->max_busy_timeout = JZ_MMC_REQ_TIMEOUT_MS;
mmc->max_blk_size = (1 << 10) - 1;
mmc->max_blk_count = (1 << 15) - 1;
mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
mmc->max_segs = 128;
mmc->max_seg_size = mmc->max_req_size;
host->mmc = mmc;
host->pdev = pdev;
spin_lock_init(&host->lock);
host->irq_mask = ~0;
jz4740_mmc_reset(host);
ret = request_threaded_irq(host->irq, jz_mmc_irq, jz_mmc_irq_worker, 0,
dev_name(&pdev->dev), host);
if (ret) {
dev_err(&pdev->dev, "Failed to request irq: %d\n", ret);
goto err_free_host;
}
jz4740_mmc_clock_disable(host);
timer_setup(&host->timeout_timer, jz4740_mmc_timeout, 0);
ret = jz4740_mmc_acquire_dma_channels(host);
if (ret == -EPROBE_DEFER)
goto err_free_irq;
host->use_dma = !ret;
platform_set_drvdata(pdev, host);
ret = mmc_add_host(mmc);
if (ret) {
dev_err(&pdev->dev, "Failed to add mmc host: %d\n", ret);
goto err_release_dma;
}
dev_info(&pdev->dev, "Ingenic SD/MMC card driver registered\n");
dev_info(&pdev->dev, "Using %s, %d-bit mode\n",
host->use_dma ? "DMA" : "PIO",
(mmc->caps & MMC_CAP_8_BIT_DATA) ? 8 :
((mmc->caps & MMC_CAP_4_BIT_DATA) ? 4 : 1));
return 0;
err_release_dma:
if (host->use_dma)
jz4740_mmc_release_dma_channels(host);
err_free_irq:
free_irq(host->irq, host);
err_free_host:
mmc_free_host(mmc);
return ret;
}
static int jz4740_mmc_remove(struct platform_device *pdev)
{
struct jz4740_mmc_host *host = platform_get_drvdata(pdev);
del_timer_sync(&host->timeout_timer);
jz4740_mmc_set_irq_enabled(host, 0xff, false);
jz4740_mmc_reset(host);
mmc_remove_host(host->mmc);
free_irq(host->irq, host);
if (host->use_dma)
jz4740_mmc_release_dma_channels(host);
mmc_free_host(host->mmc);
return 0;
}
static int jz4740_mmc_suspend(struct device *dev)
{
return pinctrl_pm_select_sleep_state(dev);
}
static int jz4740_mmc_resume(struct device *dev)
{
return pinctrl_select_default_state(dev);
}
static DEFINE_SIMPLE_DEV_PM_OPS(jz4740_mmc_pm_ops, jz4740_mmc_suspend,
jz4740_mmc_resume);
static struct platform_driver jz4740_mmc_driver = {
.probe = jz4740_mmc_probe,
.remove = jz4740_mmc_remove,
.driver = {
.name = "jz4740-mmc",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = of_match_ptr(jz4740_mmc_of_match),
.pm = pm_sleep_ptr(&jz4740_mmc_pm_ops),
},
};
module_platform_driver(jz4740_mmc_driver);
MODULE_DESCRIPTION("JZ4740 SD/MMC controller driver");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");